Cell expansion algae

The effects of phytohormones on growth and development in the algae were summarized by Lang (1965). Since then a great deal has been published on the occurrence of phytohormones and their effects on cell expansion in the... 

There are numerous reports of stimulation of cell expansion and cell division by auxin, GA, and cytokinin in a variety of multicellular and in some unicellular algae. Enhancement of growth by these higher plant hormones has been reported in the Chlorophyceae, Charophyceae, Xanthophyceae, Phaeophyceae, Rhodo-phyceae, and Cyanophyceae (see discussion by Augier 1976c). 

Within a photosynthetic unicellular alga function mechanisms which control the integrated activities of its nucleus and cytoplasm and vnthin its cytoplasm of the chloroplasts, mitochondria, micro-somes, ER membranes and hyaloplasm. Within the multicellular organism extra-cellular controls determine the distribution and activity of centres of organised cell division (meristems), of organised cell expansion and of the specialised tissues concerned with photosynthesis, the bio-synthesis of particular metabolic products, solute and water absorption, translocation and so on. Thus, superimposed upon the nutritive inter-relationships of the specialised structures within the cells we now have nutritive inter-relationships between cells fulfilling different and partial functions in the economy of the whole organism. 

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